Fox News fact-checks Trump

Moderator Chris Wallace pressed Donald Trump over his tax cut proposal, insisting that "the numbers don't add up" to Trump's claim that his proposal wouldn't explode the national debt.

Trump said he would keep costs down by making cuts at the Department of Education and across several other agencies.

But Wallace was ready with a screen that suggested otherwise. "The Education Department you talk about cutting. The total budget for the Education Department is $78 billion. And that includes Pell grants for low income students and aid to states for special education. I assume you wouldn't cut those things. The entire budget for the E.P.A., the environmental protection agency, $8 billion," he said.

"OK," Trump replied.

"The deficit this year is $544 billion. That's more than a half trillion dollars. Your numbers don't add up, sir," Wallace said.

Trump went on to argue that there was waste to be reduced across the board, which only exists, he argued, because "we don't bid properly."

So Wallace turned to Trump's Medicare proposal, and another screen. Pointing to the numbers, Wallace again said Trump's proposal didn't add up.

"I'm not only talking about drugs, I'm talking about other things," Trump said. "We will save $300 billion a year if we properly negotiate. We don't do that, we don't negotiate. We don't negotiate anything."